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developer

As a kid I played with a chemistry set (made for kids : In Italy it was a popoular game called "Il Piccolo chimico") When I read that it was possible to develop films and black and white papers with homemade ingredients, I had to try it. You will need: soluble coffee, caustic soda (not bicarbonate, but sodium carbonate), ascorbic acid (perhaps lemon juice would work equally), water.